Infineon AppNote AN272 GPS GNSS Low Noise Amplifier BGA925L6

B GA 925L 6
IMD Pe rfo rmanc e of B GA 925 L 6 wi th
Diff ere nt Applic atio n Ci rc uits unde r
Speci fic T est Con dit ions
Applic atio n N ote A N 272
Revision: Rev. 1.0
2011-08-11
RF and P r otecti on D evic es
Edition 2011-09-16
Published by
Infineon Technologies AG
81726 Munich, Germany
© 2011 Infineon Technologies AG
All Rights Reserved.
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THIS APPLICATION NOTE.
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BGA925L6
Highly Linear LNA for GPS/GLONASS/Galileo/COMPASS
Application Note AN272
Revision History: 2011-08-11
Previous Revision: None
Page
Subjects (major changes since last revision)
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HYPERTERMINAL™ of Hilgraeve Incorporated. IEC™ of Commission Electrotechnique Internationale. IrDA™
of Infrared Data Association Corporation. ISO™ of INTERNATIONAL ORGANIZATION FOR
STANDARDIZATION. MATLAB™ of MathWorks, Inc. MAXIM™ of Maxim Integrated Products, Inc.
MICROTEC™, NUCLEUS™ of Mentor Graphics Corporation. Mifare™ of NXP. MIPI™ of MIPI Alliance, Inc.
MIPS™ of MIPS Technologies, Inc., USA. muRata™ of MURATA MANUFACTURING CO., MICROWAVE
OFFICE™ (MWO) of Applied Wave Research Inc., OmniVision™ of OmniVision Technologies, Inc.
Openwave™ Openwave Systems Inc. RED HAT™ Red Hat, Inc. RFMD™ RF Micro Devices, Inc. SIRIUS™ of
Sirius Satellite Radio Inc. SOLARIS™ of Sun Microsystems, Inc. SPANSION™ of Spansion LLC Ltd.
Symbian™ of Symbian Software Limited. TAIYO YUDEN™ of Taiyo Yuden Co. TEAKLITE™ of CEVA, Inc.
TEKTRONIX™ of Tektronix Inc. TOKO™ of TOKO KABUSHIKI KAISHA TA. UNIX™ of X/Open Company
Limited. VERILOG™, PALLADIUM™ of Cadence Design Systems, Inc. VLYNQ™ of Texas Instruments
Incorporated. VXWORKS™, WIND RIVER™ of WIND RIVER SYSTEMS, INC. ZETEX™ of Diodes Zetex
Limited.
Last Trademarks Update 2011-02-24
Application Note AN272, Rev. 1.0
3 / 24
2011-08-11
BGA925L6
Highly Linear LNA for GPS/GLONASS/Galileo/COMPASS
Table of Content, List of Figures and Tables
Table of Content
1
BGA925L6 GPS Front-End LNA for High Performance Integrated Solution ................................ 6
2
Introduction ........................................................................................................................................ 7
3
Application Circuits ........................................................................................................................... 9
4
Typical Measurement Results ......................................................................................................... 10
5
Measured Graphs for different application circuits of BGA925L6 .............................................. 13
6
Miscellaneous Measured Graphs ................................................................................................... 20
7
Evaluation Boards ............................................................................................................................ 22
8
Authors .............................................................................................................................................. 23
Application Note AN272, Rev. 1.0
4 / 24
2011-08-11
BGA925L6
Highly Linear LNA for GPS/GLONASS/Galileo/COMPASS
Table of Content, List of Figures and Tables
List of Figures
Figure 1
Figure 2
Figure 3
Figure 4
Figure 5
Figure 6
Figure 7
Figure 8
Figure 9
Figure 10
Figure 11
Figure 12
Figure 13
Figure 14
Figure 15
Figure 16
Figure 17
Figure 18
Figure 19
Figure 20
BGA925L6 in TSLP-6-2 Package (0.70mm x 1.1mm x 0.40mm) ........................................................ 6
Block diagram of the BGA925L6 for GNSS band 1559-1615MHz applications .................................. 8
Wideband power gain of different application circuits at supply voltage of 1.8V ............................... 13
Wideband power gain of different application circuits at supply voltage of 2.8V ............................... 13
Narrowband power gain of different application circuits at supply voltage of 1.8V ............................ 14
Narrowband power gain of different application circuits at supply voltage of 2.8V ............................ 14
Input matching of different application circuits at supply voltage of 1.8V .......................................... 15
Input matching of different application circuits at supply voltage of 2.8V .......................................... 15
Output matching of different application circuits at supply voltage of 1.8V........................................ 16
Output matching of different application circuits at supply voltage of 2.8V........................................ 16
Reverse isolation of different application circuits at supply voltage of 1.8V ...................................... 17
Reverse isolation of different application circuits at supply voltage of 2.8V ...................................... 17
Input 1dB compression point of different application circuits at supply voltage of 1.8V .................... 18
Input 1dB compression point of different application circuits at supply voltage of 2.8V .................... 18
Noise figure of different application circuits at supply voltage of 1.8V ............................................... 19
Noise figure of different application circuits at supply voltage of 2.8V ............................................... 19
Input matching of different application circuits at supply voltage of 1.8V .......................................... 20
Input matching of different application circuits at supply voltage of 2.8V .......................................... 20
Output matching of different application circuits at supply voltage of 1.8V........................................ 21
Output matching of different application circuits at supply voltage of 2.8V........................................ 21
List of Tables
Table 1
Table 2
Table 3
Table 4
Table 5
Table 6
Table 7
Table 8
Pin Definition ........................................................................................................................................ 8
Switching Mode .................................................................................................................................... 8
Schematic diagram of various application circuits based around BGA925L6 ..................................... 9
Electrical Characteristics (at room temperature), Vcc = Vpon = 1.8 V .............................................. 10
Electrical Characteristics (at room temperature), Vcc = Vpon = 2.8 V .............................................. 11
IMD comparison of different Application Circuits at Vcc=1.8V ........................................................... 12
IMD comparison of different Application Circuits at Vcc=2.8V ........................................................... 12
PCBs for different application circuits under consideration ............................................................... 22
Application Note AN272, Rev. 1.0
5 / 24
2011-08-11
BGA925L6
Highly Linear LNA for GPS/GLONASS/Galileo/COMPASS
BGA925L6 GPS Front-End LNA for High Performance Integrated Solution
1
BGA925L6 GPS Front-End LNA for High Performance Integrated
Solution
1.1
Features
• High gain: 15.8 dB
• High out-of-band input 3rd-order intercept point: +7 dBm
• High input 1dB compression point: -5 dBm
• Low noise figure: 0.65 dB
• Low current consumption: 4.8 mA
• Operating frequency: 1550-1615 MHz
• Supply voltage: 1.5 V to 3.6 V
• Digital on/off switch (1V logic high level)
• Ultra small TSLP-6-2 leadless package
• Package dimensions: 0.70mm x 1.1mm x 0.40mm
• B7HF Silicon Germanium technology
• RF output internally matched to 50 Ω
• Only two external SMD components necessary
• 2 kV HBM ESD protection (including AI-pin)
• Pb-free (RoHS compliant) package
Figure 1
BGA925L6 in TSLP-6-2 Package (0.70mm x 1.1mm x 0.40mm)
1.2
Applications
- Global Positioning System (GPS)
- GLONASS (Russian GNSS)
- Galileo (European GNSS)
- COMPASS (Chinese Beidou Navigation System)
Application Note AN272, Rev. 1.0
6 / 24
2011-08-11
BGA925L6
Highly Linear LNA for GPS/GLONASS/Galileo/COMPASS
Introduction
2
Introduction
The BGA925L6 is a front-end Low Noise Amplifier (LNA) for Global Navigation Satellite
Systems (GNSS) application. It is based on Infineon Technologies’ B7HF Silicon-Germanium
(SiGe:C) technology, enabling a cost-effective solution in a ultra small TSLP-6-2 package
with ultra low noise figure, high gain, high linearity and low current consumption over a wide
range of supply voltages from 3.6 V down to 1.5 V. All these features make BGA925L6 an
excellent choice for GNSS LNA as it improves sensitivity, provide greater immunity against
out-of-band jammer signals, reduces filtering requirement and hence the overall cost of the
GNSS receiver.
The ever growing demand to integrate more and more functionality into one device leads to
many challenges when transmitter/receiver has to work simultaneously without degrading the
performance of each other. In today’s smart-phones a GNSS receiver simultaneously coexists with transceivers in the GSM/EDGE/UMTS/LTE bands. These 3G/4G transceivers
transmit high power in the range of +24 dBm which due to insufficient isolation couple to the
GNSS receiver. The cellular signals can mix to produce Intermodulation products exactly in
the GNSS receiver frequency band.
In this application note, different application circuits based around BGA925L6 have
been considered and compared taking into account their IMD performance under
special test cases. BGA925L6 can also be preceded with any external pre-filter by
adding necessary components required for optimal performance but in this specific
application the SAW filter of Infineon’s BGM1033N7 module has been used. Table 3
show different application circuits designed to optimize noise figure, matching and increased
rejection of jammer signals. The SAW filter used here has insertion loss of around 1dB and
high out-of-band rejection. In special cases an additional notch can be added to suppress a
specific jammer. In all the application circuits defined in Table 3, an additional “notch” has
been added to suppress LTE band-13 jammer signal since its 2nd harmonic falls into GPS
band. The component values for the notch are then fine tuned so as to have optimal noise
figure, LTE band-13 rejection, gain and input matching.
Application Note AN272, Rev. 1.0
7 / 24
2011-08-11
BGA925L6
Highly Linear LNA for GPS/GLONASS/Galileo/COMPASS
Introduction
The Internal circuit diagram of the BGA925L6 is presented in Figure 2. Table 1 shows the pin
assignment of BGA925L6. Table 2 shows the truth table to turn on/off BGA925L6 by applying
different voltage to the PON pin.
Figure 2
Table 1
Pin
Block diagram of the BGA925L6 for GNSS band 1559-1615MHz applications
Pin Definition
Symbol
Comment
1
GND
General ground
2
VCC
DC supply
3
AO
LNA output
4
GNDRF
LNA RF ground
5
AI
LNA input
6
PON
Power on control
Table 2
Mode
Switching Mode
Symbol
ON/OFF Control Voltage
Min
Max
On
PON, on
1.0V
VCC
Off
PON, off
0
0.4
Application Note AN272, Rev. 1.0
8 / 24
2011-08-11
BGA925L6
Highly Linear LNA for GPS/GLONASS/Galileo/COMPASS
Application Circuits
3
Application Circuits
Table 3
Schematic diagram of various application circuits based around BGA925L6
Application Circuit
Remarks
SAW filter from BGM1033 is used
in all the measurements where it is
specified.
IL @ 1575 MHz = 0.94 dB
IL @ 787 MHz = 20 dB
SAW
RFIN
RFOUT
BGA925L6
N1
RFin
C1
GNDRF, 4
AO, 3
AI, 5
VCC, 2
AN265 is the standard application
circuit for BGA925L6.
C1 = 1 nF (0201)
C2 = 10 nF (0201)
L1 = 5.6 nH (LQP series - 0201)
N1 = BGA925L6 (LNA)
RFout
Vcc
L1
C2
(optional)
PON, 6
GND, 1
Pon
BGA925L6
N1
RFin
GNDRF, 4
AO, 3
AI, 5
VCC, 2
PON, 6
GND, 1
TR1067 is the application which
deals with the improvement of
nd
band-13 2 harmonic.
C1 = 2.7 pF (0201)
C2 = 10 nF (0201)
C3 = 6.8 pF (0201)
L3 = 5.6 nH (LQG series – 0402)
N1 = BGA925L6 (LNA)
RFout
Vcc
C1
C2
(optional)
L3
Pon
C3
Notch
N1
SAW
RFin
BGA925L6
GNDRF, 4
AO, 3
AI, 5
VCC, 2
RFout
Vcc
C1
C2
(optional)
L1
PON, 6
GND, 1
Pon
C3
Notch
N1
SAW
BGA925L6
GNDRF, 4
AO, 3
AI, 5
VCC, 2
RFout
Vcc
L2
RFin
C1
(optional)
PON, 6
L1
GND, 1
Pon
C2
Notch
Application Note AN272, Rev. 1.0
9 / 24
SAW Notch LNA is the application
which is designed to improve LTE
nd
band-13 2 harmonic and also
suppress other out-of-band
jammers using pre-SAW filter.
C1 = 2.7 pF (0201)
C2 = 10 nF (0201)
C3 = 6.8 pF (0201)
L1 = 5.6 nH (LQG series – 0402)
N1 = BGA925L6 (LNA)
Notch SAW LNA application circuit
is designed to improve the
immunity against LTE band-13
jammers and also other out-of-band
signals by using a pre-SAW filter.
C1 = 10 nF (0201)
C2 = 4.7 pF (0201)
L1 = 8.2 nH (LQG series – 0402)
L2 = 6.8 nH (LQG series – 0402)
N1 = BGA925L6 (LNA)
2011-08-11
BGA925L6
Highly Linear LNA for GPS/GLONASS/Galileo/COMPASS
Typical Measurement Results
4
Typical Measurement Results
Table 4 to Table 7 show typical measurement result of the application circuits shown in Table
3. The values given in this table include losses of the board and the SMA connectors if not
otherwise stated.
Table 4
Electrical Characteristics (at room temperature), Vcc = Vpon = 1.8 V
Parameter
Symbol
Value
Unit
DC Voltage
Vcc
1.8
V
Frequency
Range
Freq
1575
MHz
Application
Circuit
AN265
TR1067
SAW Notch LNA Notch SAW LNA
DC Current
Icc
4.8
4.8
4.8
4.8
mA
Gain
G
15.6
15.2
14.7
15.0
dB
Noise Figure
NF
0.73
0.95
1.69
1.83
dB
Input Return
Loss
RLin
12.6
9.5
13.9
17.9
dB
Output Return
Loss
RLout
23.4
15.6
15.7
21.8
dB
Reverse
Isolation
IRev
21.8
22.4
23.4
22.6
dB
fgps = 1575
MHz
IP1dB
-8.1
-9.5
-9.5
-7.1
dBm
Output P1dB
OP1dB
6.5
4.6
4.2
6.9
dBm
Stability
k
--
--
Input P1dB
Application Note AN272, Rev. 1.0
>1
10 / 24
2011-08-11
BGA925L6
Highly Linear LNA for GPS/GLONASS/Galileo/COMPASS
Typical Measurement Results
Table 5
Electrical Characteristics (at room temperature), Vcc = Vpon = 2.8 V
Parameter
Symbol
Value
Unit
DC Voltage
Vcc
2.8
V
Frequency
Range
Freq
1575
MHz
Application
Circuit
AN265
TR1067
SAW Notch LNA Notch SAW LNA
DC Current
Icc
5.0
5.0
5.0
5.0
mA
Gain
G
15.6
15.3
14.8
15.0
dB
Noise Figure
NF
0.73
0.96
1.7
1.84
dB
Input Return
Loss
RLin
12.6
9.5
13.5
16.4
dB
Output Return
Loss
RLout
23.4
14.3
14.2
19.4
dB
Reverse
Isolation
IRev
21.8
22.9
23.1
24.0
dB
fgps = 1575
MHz
IP1dB
-7.1
-9.5
-9.3
-6.2
dBm
Output P1dB
OP1dB
6.5
4.7
4.5
7.8
dBm
Stability
k
--
--
Input P1dB
Application Note AN272, Rev. 1.0
>1
11 / 24
2011-08-11
BGA925L6
Highly Linear LNA for GPS/GLONASS/Galileo/COMPASS
Typical Measurement Results
Table 6
IMD comparison of different Application Circuits at Vcc=1.8V
AN265
a
TR1067
LTE Band-13
nd
2 Harmonic
Level [dBm]
-31.4
-104.3
In-band
Output IP3
[dBm]
16.8
10.0
Out-of-band
Output IM3 @
1575.4 MHz
[dBm]
Out-of-band
Output IM2 @
1575.4 MHz
[dBm]
Out-of-band
Output IM2 @
1575.4 MHz
[dBm]
Table 7
a
SAW
b
-84.6
SAW Notch Notch SAW Test Conditions
b
b
LNA
LNA
-68.5
-93.9
a: fIN = 787.76 MHz, PIN = -25 dBm
b: fIN = 787.76 MHz, PIN = +15 dBm
10.8
12.5
a/b: f1 = 1575.5 MHz, P1 = -30
dBm; f2 = 1576.5 MHz, P2 = -30
dBm
a: f1 = 1712.7 MHz, P1 = -41 dBm;
f2 = 1850 MHz, P2 = -41.5 dBm
-120.7
-17.4
-120.8
-95.5
-83.5
-41.2
-69.2
-66.8
-40.1
-83.0
-53.3
-24.5
-79.1
-78.3
-23.2
b: f1 = 1712.7 MHz, P1 = +10 dBm;
f2 = 1850 MHz, P2 = +10 dBm
a: f1 = 787.4 MHz, P1 = -20 dBm;
f2 = 788 MHz, P2 = -20 dBm
b: f1 = 787.4 MHz, P1 = +20 dBm;
f2 = 788 MHz, P2 = +20 dBm
a: f1 = 824.6 MHz, P1 = -17 dBm;
f2 = 2400 MHz, P2 = -40 dBm
b: f1 = 824.6 MHz, P1 = +23 dBm; f2
= 2400 MHz, P2 = 0 dBm
IMD comparison of different Application Circuits at Vcc=2.8V
AN265
a
TR1067
LTE Band-13
nd
2 Harmonic
Level [dBm]
-31.7
-104.7
In-band
Output IP3
[dBm]
17.5
10.1
Out-of-band
Output IM3 @
1575.4 MHz
[dBm]
Out-of-band
Output IM2 @
1575.4 MHz
[dBm]
Out-of-band
Output IM2 @
1575.4 MHz
[dBm]
a
SAW
b
-84.6
SAW Notch Notch SAW Test Conditions
b
b
LNA
LNA
a: fIN = 787.76 MHz, PIN = -25 dBm
-68.5
-93.8
b: fIN = 787.76 MHz, PIN = +15 dBm
10.9
12.5
a/b: f1 = 1575.5 MHz, P1 = -30
dBm; f2 = 1576.5 MHz, P2 = -30
dBm
a: f1 = 1712.7 MHz, P1 = -41 dBm;
f2 = 1850 MHz, P2 = -41.5 dBm
-119.7
-17.5
-41.2
-119.8
-83.7
-66.9
Application Note AN272, Rev. 1.0
-95.5
-69.2
-40.1
-83.2
-53.3
-24.5
12 / 24
-79.0
-78.7
-23.1
b: f1 = 1712.7 MHz, P1 = +10 dBm;
f2 = 1850 MHz, P2 = +10 dBm
a: f1 = 787.4 MHz, P1 = -20 dBm;
f2 = 788 MHz, P2 = -20 dBm
b: f1 = 787.4 MHz, P1 = +20 dBm;
f2 = 788 MHz, P2 = +20 dBm
a: f1 = 824.6 MHz, P1 = -17 dBm;
f2 = 2400 MHz, P2 = -40 dBm
b: f1 = 824.6 MHz, P1 = +23 dBm;
f2 = 2400 MHz, P2 = 0 dBm
2011-08-11
BGA925L6
Highly Linear LNA for GPS/GLONASS/Galileo/COMPASS
Measured Graphs for different application circuits of BGA925L6
5
Measured Graphs for different application circuits of BGA925L6
Figure 3
Wideband power gain of different application circuits at supply voltage of 1.8V
Figure 4
Wideband power gain of different application circuits at supply voltage of 2.8V
Application Note AN272, Rev. 1.0
13 / 24
2011-08-11
BGA925L6
Highly Linear LNA for GPS/GLONASS/Galileo/COMPASS
Measured Graphs for different application circuits of BGA925L6
Figure 5
Narrowband power gain of different application circuits at supply voltage of 1.8V
Figure 6
Narrowband power gain of different application circuits at supply voltage of 2.8V
Application Note AN272, Rev. 1.0
14 / 24
2011-08-11
BGA925L6
Highly Linear LNA for GPS/GLONASS/Galileo/COMPASS
Measured Graphs for different application circuits of BGA925L6
Figure 7
Input matching of different application circuits at supply voltage of 1.8V
Figure 8
Input matching of different application circuits at supply voltage of 2.8V
Application Note AN272, Rev. 1.0
15 / 24
2011-08-11
BGA925L6
Highly Linear LNA for GPS/GLONASS/Galileo/COMPASS
Measured Graphs for different application circuits of BGA925L6
Figure 9
Output matching of different application circuits at supply voltage of 1.8V
Figure 10
Output matching of different application circuits at supply voltage of 2.8V
Application Note AN272, Rev. 1.0
16 / 24
2011-08-11
BGA925L6
Highly Linear LNA for GPS/GLONASS/Galileo/COMPASS
Measured Graphs for different application circuits of BGA925L6
Figure 11
Reverse isolation of different application circuits at supply voltage of 1.8V
Figure 12
Reverse isolation of different application circuits at supply voltage of 2.8V
Application Note AN272, Rev. 1.0
17 / 24
2011-08-11
BGA925L6
Highly Linear LNA for GPS/GLONASS/Galileo/COMPASS
Measured Graphs for different application circuits of BGA925L6
1dB compression point at 1575MHz with Vcc=1.8V
20
AN265
TR1067
SAW Notch LNA
18
Notch SAW LNA
Gain (dB)
-25 dBm
15.48 dB
-25 dBm
15.05 dB
16
-25 dBm
14.9 dB
14
-8.116 dBm
14.48 dB
-9.513 dBm
14.05 dB
-25 dBm
14.61 dB
12
-7.142 dBm
13.9 dB
-9.532 dBm
13.61 dB
10
-25
Figure 13
-20
-15
-10
Power (dBm)
-5
0
Input 1dB compression point of different application circuits at supply voltage of 1.8V
1dB compression point at 1575MHz with Vcc=2.8V
20
AN265
TR1067
SAW Notch LNA
Gain (dB)
18
-25 dBm
15.6 dB
Notch SAW LNA
-25 dBm
15.14 dB
16
-7.056 dBm
14.6 dB
-6.21 dBm
13.95 dB
-25 dBm
14.95 dB
14
-9.541 dBm
14.14 dB
-25 dBm
14.66 dB
12
-9.306 dBm
13.66 dB
10
-25
Figure 14
-20
-15
-10
Power (dBm)
-5
0
Input 1dB compression point of different application circuits at supply voltage of 2.8V
Application Note AN272, Rev. 1.0
18 / 24
2011-08-11
BGA925L6
Highly Linear LNA for GPS/GLONASS/Galileo/COMPASS
Measured Graphs for different application circuits of BGA925L6
Figure 15
Noise figure of different application circuits at supply voltage of 1.8V
Figure 16
Noise figure of different application circuits at supply voltage of 2.8V
Application Note AN272, Rev. 1.0
19 / 24
2011-08-11
BGA925L6
Highly Linear LNA for GPS/GLONASS/Galileo/COMPASS
Miscellaneous Measured Graphs
6
Miscellaneous Measured Graphs
0.8
1.0
Input matching @ Vcc=1.8V
SAW
Swp Max
1609MHz
TR1067
2.
0
6
0.
AN265
SAW Notch LNA
0.
4
0
3.
Notch SAW LNA
1575 MHz
r 1.00565
x 0.256949
5.0
1575 MHz
r 1.21398
x -0.158729
10.0
10.0
5.0
4.0
2.0
1.0
0.8
0.6
0.4
0.2
0.2
3.0
1575 MHz
r 1.3459
x 0.723679
1575 MHz
r 0.631775
x 0.102603
1575 MHz
r 0.666205
x 0.0255987
0
0
4.
-10.0
2
-0.
-4
.0
-5.
0
-3
.0
Figure 17
.0
-2
Swp Min
1575MHz
-1.0
-0.8
-0
.6
.4
-0
Input matching of different application circuits at supply voltage of 1.8V
0.8
1.0
Input matching @ Vcc=2.8V
SAW
Swp Max
1609MHz
TR1067
2.
0
6
0.
AN265
SAW Notch LNA
0.
4
0
3.
Notch SAW LNA
5.0
10.0
10.0
5.0
4.0
1575 MHz
r 1.21398
x -0.158729
3.0
1.0
0.8
0
1575 MHz
r 0.65033
x -0.00393831
0.6
0.4
0.2
0.2
1575 MHz
r 0.641931
x 0.0662929
0
4.
1575 MHz
r 1.27495
x 0.742449
2.0
1575 MHz
r 1.00075
x 0.305462
-10.0
2
-0.
-4
.0
-5.
0
-3
.0
Figure 18
.0
-2
-1.0
-0.8
-0
.6
.4
-0
Swp Min
1575MHz
Input matching of different application circuits at supply voltage of 2.8V
Application Note AN272, Rev. 1.0
20 / 24
2011-08-11
BGA925L6
Highly Linear LNA for GPS/GLONASS/Galileo/COMPASS
Miscellaneous Measured Graphs
0.8
1.0
Output matching @ Vcc=1.8V
SAW
Swp Max
1609MHz
TR1067
2.
0
6
0.
AN265
SAW Notch LNA
0.
4
0
3.
Notch SAW LNA
1575 MHz
r 0.826679
x 0.248187
0
4.
1575 MHz
r 0.995348
x 0.332921
5.0
0.2
1575 MHz
r 1.08027
x -0.239448
2
-0.
-4
.0
-5.
0
-3
.0
Swp Min
1575MHz
-1.0
-0.8
-0
.6
.0
-2
.4
-0
Figure 19
10.0
5.0
4.0
3.0
2.0
1.0
0.8
0.4
0.2
1575 MHz
r 1.06274
x 0.156526
-10.0
0
0.6
10.0
1575 MHz
r 0.87259
x 0.00156279
Output matching of different application circuits at supply voltage of 1.8V
0.8
1.0
Output matching @ Vcc=2.8V
SAW
Swp Max
1609MHz
TR1067
2.
0
6
0.
AN265
SAW Notch LNA
0.
4
0
3.
Notch SAW LNA
0
4.
5.0
10.0
1575 MHz
r 1.08027
x -0.239448
2
-0.
4
.0
-5.
0
-3
.0
.0
-2
-1.0
-0.8
-0
.6
.4
-0
Figure 20
5.0
10.0
4.0
3.0
1575 MHz
r 1.01576
x 0.217306
2.0
1.0
0.4
0.2
1575 MHz
r 0.979303
x 0.38534
-10.0
0
0.8
0.2
1575 MHz
r 0.859237
x 0.0518487
0.6
1575 MHz
r 0.786516
x 0.281071
Swp Min
1575MHz
Output matching of different application circuits at supply voltage of 2.8V
Application Note AN272, Rev. 1.0
21 / 24
2011-08-11
BGA925L6
Highly Linear LNA for GPS/GLONASS/Galileo/COMPASS
Evaluation Boards
7
Evaluation Boards
Table 8
PCBs for different application circuits under consideration
SAW filter (From BGM1033 Module), Rogers
TR1067 – BGA925L6 with 787 MHz notch, FR4
AN265 - Standard Application board BGA925L6, FR4
SAW Notch LNA – BGA925L6 with SAW filter and
Notch, FR4
Notch SAW LNA – BGA925L6 with Notch and SAW
filter, FR4
Application Note AN272, Rev. 1.0
PCB layer stack
22 / 24
2011-08-11
BGA925L6
Highly Linear LNA for GPS/GLONASS/Galileo/COMPASS
Authors
8
Authors
Jagjit Singh Bal, Application Engineer of Business Unit “RF and Protection Devices”.
Dr. Chih-I Lin, Senior Staff Engineer of Business Unit “RF and Protection Devices”.
Application Note AN272, Rev. 1.0
23 / 24
2011-08-11
w w w . i n f i n e o n . c o m
Published by Infineon Technologies AG
AN272